66411804631 has 4 divisors (see below), whose sum is σ = 70318381392. Its totient is φ = 62505227872.

The previous prime is 66411804617. The next prime is 66411804647. The reversal of 66411804631 is 13640811466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13640811466 = 2 ⋅6820405733.

It is a cyclic number.

It is not a de Polignac number, because 66411804631 - 2²⁵ = 66378250199 is a prime.

It is a super-3 number, since 3×66411804631³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411804611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1953288355 + ... + 1953288388.

It is an arithmetic number, because the mean of its divisors is an integer number (17579595348).

Almost surely, 2^66411804631 is an apocalyptic number.

66411804631 is a deficient number, since it is larger than the sum of its proper divisors (3906576761).

66411804631 is a wasteful number, since it uses less digits than its factorization.

66411804631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906576760.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 66411804631 in words is "sixty-six billion, four hundred eleven million, eight hundred four thousand, six hundred thirty-one".